dart:_http: apply and fix most of pkg:lints recommended lints

TEST=N/A

Change-Id: I3e3f0cd1d94743fbbe8cfcc5723eb38608be2a8b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/217503
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>
Auto-Submit: Kevin Moore <kevmoo@google.com>

Author: kevmoo

pkg/compiler/test/analyses/api_allowed.json

@@ -94,36 +94,16 @@
   "org-dartlang-sdk:///lib/convert/json.dart": {
     "Dynamic invocation of 'toJson'.": 1
   },
-  "org-dartlang-sdk:///lib/_http/crypto.dart": {
-    "Dynamic invocation of '+'.": 2,
-    "Dynamic invocation of '&'.": 3,
-    "Dynamic invocation of 'unary-'.": 1,
-    "Dynamic invocation of '-'.": 2
-  },
-  "org-dartlang-sdk:///lib/_http/http_date.dart": {
-    "Dynamic access of 'length'.": 3,
-    "Dynamic invocation of '<'.": 1,
-    "Dynamic invocation of '>='.": 2,
-    "Dynamic invocation of '[]'.": 7
-  },
-  "org-dartlang-sdk:///lib/_http/http_headers.dart": {
-    "Dynamic invocation of 'toLowerCase'.": 1
-  },
   "org-dartlang-sdk:///lib/_http/http_impl.dart": {
-    "Dynamic access of 'headers'.": 1,
-    "Dynamic invocation of 'forEach'.": 1,
-    "Dynamic access of 'connectionInfo'.": 4,
-    "Dynamic access of 'localPort'.": 1,
-    "Dynamic access of 'remoteAddress'.": 2,
-    "Dynamic access of 'address'.": 4,
-    "Dynamic access of 'remotePort'.": 2,
     "Dynamic access of 'message'.": 3,
-    "Dynamic invocation of 'call'.": 1,
     "Dynamic invocation of 'destroy'.": 2,
+    "Dynamic access of 'address'.": 3,
     "Dynamic access of 'type'.": 1,
     "Dynamic invocation of 'setOption'.": 1,
     "Dynamic access of 'host'.": 2,
     "Dynamic access of 'port'.": 2,
+    "Dynamic access of 'remoteAddress'.": 1,
+    "Dynamic access of 'remotePort'.": 1,
     "Dynamic invocation of 'dart._http::_toJSON'.": 3,
     "Dynamic invocation of 'listen'.": 1,
     "Dynamic invocation of 'close'.": 1

pkg/front_end/testcases/nnbd_mixed/mock_http_headers.dart.weak.outline.expect

@@ -170,8 +170,8 @@ Evaluated: MapLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 ->
 Evaluated: SymbolLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 -> SymbolConstant(#noFolding)
 Evaluated: ListLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 -> ListConstant(const <Type*>[])
 Evaluated: MapLiteral @ org-dartlang-testcase:///mock_http_headers.dart:13:7 -> MapConstant(const <Symbol*, dynamic>{})
-Evaluated: SymbolLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> SymbolConstant(#clear)
-Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> ListConstant(const <Type*>[])
-Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> ListConstant(const <dynamic>[])
-Evaluated: MapLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:782:8 -> MapConstant(const <Symbol*, dynamic>{})
+Evaluated: SymbolLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:707:8 -> SymbolConstant(#clear)
+Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:707:8 -> ListConstant(const <Type*>[])
+Evaluated: ListLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:707:8 -> ListConstant(const <dynamic>[])
+Evaluated: MapLiteral @ org-dartlang-sdk:///sdk/lib/_http/http.dart:707:8 -> MapConstant(const <Symbol*, dynamic>{})
 Extra constant evaluation: evaluated: 268, effectively constant: 91

pkg/vm/testcases/transformations/type_flow/transformer/enum_from_lib_used_as_type.dart.expect

@@ -22,6 +22,6 @@ class Class extends core::Object {
   synthetic constructor •() → self::Class
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3266,getterSelectorId:3267]  method method([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::Enum e) → core::int
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3252,getterSelectorId:3253]  method method([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::Enum e) → core::int
     return [@vm.inferred-type.metadata=!] e.{core::_Enum::index}{core::int};
 }

pkg/vm/testcases/transformations/type_flow/transformer/tree_shake_enum_from_lib.dart.expect

@@ -51,6 +51,6 @@ class ConstClass extends core::Object {
   synthetic constructor •() → self::ConstClass
     : super core::Object::•()
     ;
-[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3270,getterSelectorId:3271]  method method([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::ConstEnum e) → core::int
+[@vm.procedure-attributes.metadata=methodOrSetterCalledDynamically:false,getterCalledDynamically:false,hasThisUses:false,hasTearOffUses:false,methodOrSetterSelectorId:3256,getterSelectorId:3257]  method method([@vm.inferred-type.metadata=dart.core::Null? (value: null)] self::ConstEnum e) → core::int
     return [@vm.inferred-type.metadata=!] e.{core::_Enum::index}{core::int};
 }

sdk/lib/_http/crypto.dart

@@ -21,7 +21,7 @@ class _CryptoUtils {
   // -1 : '\r' or '\n'
   //  0 : = (Padding character).
   // >0 : Base 64 alphabet index of given byte.
-  static const List<int> _decodeTable = const [
+  static const List<int> _decodeTable = [
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -2, -2, -1, -2, -2, //
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, //
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, 62, -2, 63, //
@@ -40,18 +40,16 @@ class _CryptoUtils {
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2
   ];
 
-  static Random _rng = new Random.secure();
-
   static Uint8List getRandomBytes(int count) {
-    final Uint8List result = new Uint8List(count);
+    final Uint8List result = Uint8List(count);
     for (int i = 0; i < count; i++) {
-      result[i] = _rng.nextInt(0xff);
+      result[i] = Random.secure().nextInt(0xff);
     }
     return result;
   }
 
   static String bytesToHex(List<int> bytes) {
-    var result = new StringBuffer();
+    var result = StringBuffer();
     for (var part in bytes) {
       result.write('${part < 16 ? '0' : ''}${part.toRadixString(16)}');
     }
@@ -66,15 +64,15 @@ class _CryptoUtils {
     }
     final String lookup = urlSafe ? _encodeTableUrlSafe : _encodeTable;
     // Size of 24 bit chunks.
-    final int remainderLength = len.remainder(3) as int;
+    final int remainderLength = len.remainder(3);
     final int chunkLength = len - remainderLength;
     // Size of base output.
     int outputLen = ((len ~/ 3) * 4) + ((remainderLength > 0) ? 4 : 0);
     // Add extra for line separators.
     if (addLineSeparator) {
       outputLen += ((outputLen - 1) ~/ LINE_LENGTH) << 1;
     }
-    List<int> out = new List<int>.filled(outputLen, 0);
+    List<int> out = List<int>.filled(outputLen, 0);
 
     // Encode 24 bit chunks.
     int j = 0, i = 0, c = 0;
@@ -111,14 +109,14 @@ class _CryptoUtils {
       out[j++] = PAD;
     }
 
-    return new String.fromCharCodes(out);
+    return String.fromCharCodes(out);
   }
 
   static List<int> base64StringToBytes(String input,
       [bool ignoreInvalidCharacters = true]) {
     int len = input.length;
     if (len == 0) {
-      return new List<int>.empty();
+      return List<int>.empty();
     }
 
     // Count '\r', '\n' and illegal characters, For illegal characters,
@@ -129,13 +127,13 @@ class _CryptoUtils {
       if (c < 0) {
         extrasLen++;
         if (c == -2 && !ignoreInvalidCharacters) {
-          throw new FormatException('Invalid character: ${input[i]}');
+          throw FormatException('Invalid character: ${input[i]}');
         }
       }
     }
 
     if ((len - extrasLen) % 4 != 0) {
-      throw new FormatException('''Size of Base 64 characters in Input
+      throw FormatException('''Size of Base 64 characters in Input
           must be a multiple of 4. Input: $input''');
     }
 
@@ -147,7 +145,7 @@ class _CryptoUtils {
       if (currentCodeUnit == PAD) padLength++;
     }
     int outputLen = (((len - extrasLen) * 6) >> 3) - padLength;
-    List<int> out = new List<int>.filled(outputLen, 0);
+    List<int> out = List<int>.filled(outputLen, 0);
 
     for (int i = 0, o = 0; o < outputLen;) {
       // Accumulate 4 valid 6 bit Base 64 characters into an int.
@@ -183,20 +181,19 @@ abstract class _HashBase {
   final bool _bigEndianWords;
   int _lengthInBytes = 0;
   List<int> _pendingData;
-  List<int> _currentChunk;
-  List<int> _h;
+  final List<int> _currentChunk;
+  final List<int> _h;
   bool _digestCalled = false;
 
   _HashBase(this._chunkSizeInWords, int digestSizeInWords, this._bigEndianWords)
       : _pendingData = [],
-        _currentChunk = new List.filled(_chunkSizeInWords, 0),
-        _h = new List.filled(digestSizeInWords, 0);
+        _currentChunk = List.filled(_chunkSizeInWords, 0),
+        _h = List.filled(digestSizeInWords, 0);
 
   // Update the hasher with more data.
   add(List<int> data) {
     if (_digestCalled) {
-      throw new StateError(
-          'Hash update method called after digest was retrieved');
+      throw StateError('Hash update method called after digest was retrieved');
     }
     _lengthInBytes += data.length;
     _pendingData.addAll(data);
@@ -211,7 +208,7 @@ abstract class _HashBase {
     _digestCalled = true;
     _finalizeData();
     _iterate();
-    assert(_pendingData.length == 0);
+    assert(_pendingData.isEmpty);
     return _resultAsBytes();
   }
 
@@ -227,8 +224,8 @@ abstract class _HashBase {
   _updateHash(List<int> m);
 
   // Helper methods.
-  _add32(x, y) => (x + y) & _MASK_32;
-  _roundUp(val, n) => (val + n - 1) & -n;
+  int _add32(int x, int y) => (x + y) & _MASK_32;
+  int _roundUp(int val, int n) => (val + n - 1) & -n;
 
   // Rotate left limiting to unsigned 32-bit values.
   int _rotl32(int val, int shift) {
@@ -266,7 +263,7 @@ abstract class _HashBase {
 
   // Convert a 32-bit word to four bytes.
   List<int> _wordToBytes(int word) {
-    List<int> bytes = new List.filled(_BYTES_PER_WORD, 0);
+    List<int> bytes = List.filled(_BYTES_PER_WORD, 0);
     bytes[0] = (word >> (_bigEndianWords ? 24 : 0)) & _MASK_8;
     bytes[1] = (word >> (_bigEndianWords ? 16 : 8)) & _MASK_8;
     bytes[2] = (word >> (_bigEndianWords ? 8 : 16)) & _MASK_8;
@@ -323,10 +320,10 @@ class _MD5 extends _HashBase {
 
   // Returns a new instance of this Hash.
   _MD5 newInstance() {
-    return new _MD5();
+    return _MD5();
   }
 
-  static const _k = const [
+  static const _k = [
     0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, //
     0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, //
     0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340, //
@@ -340,7 +337,7 @@ class _MD5 extends _HashBase {
     0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
   ];
 
-  static const _r = const [
+  static const _r = [
     7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, //
     20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, //
     16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, //
@@ -357,8 +354,8 @@ class _MD5 extends _HashBase {
     var c = _h[2];
     var d = _h[3];
 
-    var t0;
-    var t1;
+    int t0;
+    int t1;
 
     for (var i = 0; i < 64; i++) {
       if (i < 16) {
@@ -392,7 +389,7 @@ class _MD5 extends _HashBase {
 
 // The SHA1 hasher is used to compute an SHA1 message digest.
 class _SHA1 extends _HashBase {
-  List<int> _w;
+  final List<int> _w;
 
   // Construct a SHA1 hasher object.
   _SHA1()
@@ -407,7 +404,7 @@ class _SHA1 extends _HashBase {
 
   // Returns a new instance of this Hash.
   _SHA1 newInstance() {
-    return new _SHA1();
+    return _SHA1();
   }
 
   // Compute one iteration of the SHA1 algorithm with a chunk of